hough (HEAD)

hough — Hough transform

Functions

void	gwy_data_field_hough_line ()
void	gwy_data_field_hough_circle ()
void	gwy_data_field_hough_line_strenghten ()
void	gwy_data_field_hough_circle_strenghten ()
gint	gwy_data_field_get_local_maxima_list ()
gint	gwy_data_field_get_local_minima_list ()
void	gwy_data_field_hough_polar_line_to_datafield ()
void	gwy_data_field_hough_datafield_line_to_polar ()

Includes

#include <libprocess/gwyprocess.h>

Description

Functions

gwy_data_field_hough_line ()

void
gwy_data_field_hough_line (GwyDataField *dfield,
                           GwyDataField *x_gradient,
                           GwyDataField *y_gradient,
                           GwyDataField *result,
                           gint hwidth,
                           gboolean overlapping);

gwy_data_field_hough_circle ()

void
gwy_data_field_hough_circle (GwyDataField *dfield,
                             GwyDataField *x_gradient,
                             GwyDataField *y_gradient,
                             GwyDataField *result,
                             gdouble radius);

gwy_data_field_hough_line_strenghten ()

void
gwy_data_field_hough_line_strenghten (GwyDataField *dfield,
                                      GwyDataField *x_gradient,
                                      GwyDataField *y_gradient,
                                      gint hwidth,
                                      gdouble threshold);

gwy_data_field_hough_circle_strenghten ()

void
gwy_data_field_hough_circle_strenghten
                               (GwyDataField *dfield,
                                GwyDataField *x_gradient,
                                GwyDataField *y_gradient,
                                gdouble radius,
                                gdouble threshold);

gwy_data_field_get_local_maxima_list ()

gint
gwy_data_field_get_local_maxima_list (GwyDataField *dfield,
                                      gdouble *xdata,
                                      gdouble *ydata,
                                      gdouble *zdata,
                                      gint ndata,
                                      gint skip,
                                      gdouble threshold,
                                      gboolean subpixel);

Locates local maxima in a data field.

At most ndata maxima are located (with the largest values).

Parameters

dfield	A two-dimensional data field.
xdata	Array of ndata elements where the columns should be stored.
ydata	Array of ndata elements where the rows should be stored.
zdata	Array of ndata elements where the values should be stored.
ndata	Number of items in xdata , ydata and zdata .
skip	Minimum pixel distance between maxima.
threshold	Minimum value to be considered a maximum.
subpixel	TRUE for subpixel refinement.

Returns

The actual number of maxima found.

gwy_data_field_get_local_minima_list ()

gint
gwy_data_field_get_local_minima_list (GwyDataField *dfield,
                                      gdouble *xdata,
                                      gdouble *ydata,
                                      gdouble *zdata,
                                      gint ndata,
                                      gint skip,
                                      gdouble threshold,
                                      gboolean subpixel);

Locates local minima in a data field.

At most ndata minima are located (with the smallest values).

Parameters

dfield	A two-dimensional data field.
xdata	Array of ndata elements where the columns should be stored.
ydata	Array of ndata elements where the rows should be stored.
zdata	Array of ndata elements where the values should be stored.
ndata	Number of items in xdata , ydata and zdata .
skip	Minimum pixel distance between minima.
threshold	Maximum value to be considered a minimum.
subpixel	TRUE for subpixel refinement.

Returns

The actual number of minima found.

Since: 2.59

gwy_data_field_hough_polar_line_to_datafield ()

void
gwy_data_field_hough_polar_line_to_datafield
                               (GwyDataField *dfield,
                                gdouble rho,
                                gdouble theta,
                                gint *px1,
                                gint *px2,
                                gint *py1,
                                gint *py2);

gwy_data_field_hough_datafield_line_to_polar ()

void
gwy_data_field_hough_datafield_line_to_polar
                               (gint px1,
                                gint px2,
                                gint py1,
                                gint py2,
                                gdouble *rho,
                                gdouble *theta);